Feasibility of determining corrosion rates by means of stray current-induced polarisation
Feasibility of determining corrosion rates by means of stray current-induced polarisation
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DOI：
10.1007/s10800-008-9591-6
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发表时间：
2008-10-01
影响因子：
2.9
通讯作者：
Castellote, M.
中科院分区：
文献类型：
--
作者：
Andrade, C.;Martinez, I.;Castellote, M.
为了测量金属腐蚀，必须与充当工作电极的样本或部件进行直接物理接触。测定腐蚀电流最广泛使用的方法是电化学法，即所谓的极化电阻法。本研究研究了一种无需直接物理接触即可极化金属的新方法的可行性。通过使用外部电场感应电流来获得所需的电势偏移。用于计算腐蚀速率的模型假设所施加的电流并行通过电解质和金属，并使金属静电极化。系统的总电阻可以表示为 1/Re+M = 1/R-e + 1/R-M ，其中 Re+M 是测量的总电阻，R-e 是电解质电阻，R-M 是金属电阻。后者对静电极化的抵抗力与法拉第反应有关，这通过与重量损失的比较得到验证。该电阻被称为感应极化电阻 R-pi，以区别于传统的极化电阻 R-p。
To measure metal corrosion it is necessary to make direct physical contact with the specimen or component acting as the working electrode. The most widely used method for determining the corrosion current is electrochemical, the so-called polarisation resistance method. The feasibility of a new method to polarise the metal without the need for direct physical contact was investigated in the present study. The required potential shift is obtained by induction of a current using an external electrical field. The model used for calculation of the corrosion rate assumes that the applied current runs in parallel through the electrolyte and the metal, and electrostatically polarises the metal. The overall electrical resistance of the system can then be expressed as 1/Re+M = 1/R-e + 1/R-M , where Re+M is the total resistance measured, R-e is electrolyte resistance and R-M is resistance due to the metal. This latter resistance to electrostatic polarisation is related to the faradaic reaction, which was verified by comparison with the gravimetric losses. This resistance has been called inductive polarisation resistance R-pi to distinguish it from the traditional polarisation resistance R-p.